Grinding wheel spindle reciprocating mechanism



H. A. SILVEN GRINDING WHEEL SPINDLE RECIPROCATING MECHANISM 2 Sheets-Sheet 1 Opt. 15, 1946.

Filed Oct. 29, 1945 HERBERT A. SILVEN 1;. i5, 26.. A $|LVEN I 2,499,450 GRINDING WHEEL SPINDLE RECIPROCATING MECHANISM Filed Oct. 29, 1945 2 Sheets-Sheet 2 HERBERT A. S'ILVEN Patented Oct. 15, 1 946 PATENT OFFICE GRINDING WHEEL SPINDLE RECIPROCAT- 3 ING MECHANISM Herbert A. Silven, Worcester, Mass., assignor to Norton Company, Worcester, Mass., a corporation of Massachusetts Application October 29, 1945, Serial No. 625,374

11 Claims.

This invention relates to grinding machines and more particularly to a grinding wheel spindle reciprocating and positioning mechanism.

One object of the invention is to provide a simple and thoroughly practical grinding wheel spindle reciprocating mechanism. Another object of the invention is to provide a grinding wheel spindle reciprocating and positioning mechanism in which a fluid motor is arranged to impart the reciprocatory motion to the wheel spindle. Another object of the invention is to provide a manually operable control lever which is arranged to stop and start the fluid motor for reciprocating the spindle when moved to one direction and when moved in the opposite direction to stop the wheel spindle reciprocating motor and manually to move the wheel spindle axially to position the grinding wheel in a predetermined position for a grinding operation. Another object of the invention is to provide a wheel spindle reciprocating mechanism in which a manually operable lever serves to actuate the control valve for starting and stopping a fluid motor for reciprocating the wheel spindle and also to disconnect the motor from the spindle when the motor is stopped so as to facilitate a manual positioning of the wheel spindle for a shoulder grinding operation.

This invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts as will be exemplified in the structure to be hereinafter described and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which is shown one of various possible embodiments of the mechanical features of this invention,

Fig. 1 is a fragmentary front view, partly in section, of a grinding machine wheel slide embodying the invention;

Fig. 2 is a fragmentary cross sectional view, through the wheel slide, showing the wheel spindle reciprocating mechanism partly in section and partly in elevation;

Fig. 3 is a fragmentary vertical sectional view showing the means for disconnecting the reciprocating lever and also showing the control valve;

Fig. 4 is a fragmentary horizontal sectional view, taken approximately on the line' 44 of Fig. 2, showing the piston and cylinder and reciprocation lever mechanism;

Fig. 5 is a fragmentary horizontal sectional 'view, taken approximately on theline 5-5 of Fig. 1, showing the fluid motor control valve in 2 elevation and the stroke adjusting mechanism in section;

Fig. 6 is a fragmentary vertical sectional view, taken approximately on the line 6--6 of Fig. 2; Fig. '7 is a fragmentary sectional view, on an enlarged scale, of the spring pressed ball for engaging the plate and locating and holding the control lever in position;

Fig. 8 is a fragmentary plan view, on an enlarged scale, of the plate having notches therein for locating th control lever;

Fig. 9 is a fragmentary vertical sectional view, taken approximately on the line 9--9 of Fig. 3, through the cam and lever mechanism for disconnecting the fluid motor;

Fig. 10 is a fragmentary staggered sectional view, taken approximately on the line Ill-l0 of Fig. 3, through the fluid control valve and also through the spindle locking mechanism with the control lever in a spindle reciprocating position;

Fig. 11 is a fragmentary sectional view, taken approximately on the line ll--ll of Fig. 3, through the control valve with the control lever in a spindle reciprocating position;

Fig. 12 isa fragmentary sectional view, taken approximately on the line lil l, but with the valve and control lever in an intermediate position;

Fig. 13 is a fragmentary sectional view, taken approximately on the line' Ill-l0, but with the valve and control lever in an intermediate position;

Fig. 14 is a fragmentary sectional view, taken approximately on the line lI--| I, but with the valve and control lever in a spindle stopped position; and r Fig. 15 is a fragmentary sectional view, taken approximately on the line l0l0 but with the valve and control lever in a spindle stopped po- 40 sition.

A grinding machine embodying this invention has been illustrated in the drawings comprising a base In which supports a transversely movable grinding wheel slide II on a transversely arranged 5 V-way l2 and a flat-way [3 formed on the base It A feeding mechanism is provided for feed-1 ing th wheel slide transversely relative, to the base In comprising, the old and well known, rotatable mounted feed screw 14 which meshes with a half nut [5 depending from the under side of eating movement relative thereto- A grinding arranged to engage an actuating cam 55.

3 wheel I! is mounted at the left hand end of the wheel spindle l6 (Fig. 1) and a V-groove pulley I3 is mounted on the right hand end of the wheel spindle l6 with V-belts in position.

A wheel spindle positioning and reciprocating mechanism is provided for reciprocating and moving the wheel spindle l6 axially within its bearings. This mechanism may comprise a flanged sleeve which is held in a fixed position.

on the wheel spindle It by means of a set screw 2i. A collar 22 is keyed on the sleeve 26 so as to form an annular groove 23. A pair of lock nuts or collars 24 are threaded onto the right hand end of the sleeve 2. The collars 24 serve to adjust the collar 22 to provide for taking up lost motion between the groove 23 and an annular ring 25 which mates with the groove 23.

A yoked arm 26 is pivotally supported on a rock shaft 27 and is provided with a pair of diametricallyopposed studs 28 and 29 which are arranged to mate with diametrically opposed holes formed in the ring 25 thereby supporting the ring 25. The yoked arm 26 also supports a stud 30 which engages an elongated slot 3| formed in the end of a rock arm 32. The rock arm 32 is keyed to the lower end of a rock shaft 33. A rock arm 34 is rotatably supported near the upper end of the rock shaft 33.

v A hydraulically operated motor is provided for oscillating the yoked member 26 so as to impart a reciprocatory movement to the wheel spindle is for a plunge-cut grinding operation. This hydraulic motor is substantially the same as that shown in the prior U. S. patent t Wallace H. Wood, No. 2,212,871, dated August 27, 1940, to which reference may be had details of disclosure not contained herein. This motor may comprise a cylinder 35 (Fig. 4) which supports a slidably mounted piston 35. The piston 36 is fixedly mounted on one end of a piston rod 31. The other end ofthe piston rod 3'! is provided with a spoolshaped member 38 having an annular groove 39 formed therein. The rock arm 34 is provided at its right hand end (Fig. l) with a yoked end which engages the groove 39 so that reciprocatory movement of the piston 35 will be transmitted to oscillate the rock arm 34.

It is desirable to provide suitable mechanism whereby the rock arm 34 may be readily connected to or disconnected from the rock shaft 33 so that the fluid motor may be readily connected or disconnected from the yoked member 26 when desired. A pivotally mounted rock arm 43 '(Fig. 3) passes through a vertical slot-4l (Fig. 6) formed in the rock shaft 33 and is pivotally connected with the rock shaft 33 by means of a stud '52. The rock arm 45 is provided with a downwardly projecting integral lug 43 which is arranged to engage a notch or groove 54 formed in the rock arm 35. A compression spring 45 normally serves to hold the rock arm 55 with the downwardly projecting lug 53 in engagement with the groove 44. The other end of the rock arm 45 is'provided with a projecting lug 46 (Figs. 3 and 9) which is arrangedto be engaged by a rock arm 45 which is pivotally supported on a stud 43.

"The other end of the rock arm 4? is provided with an adjustably supported screw 58 which is The cam 50 is fixedly mounted on a rock shaft 5i and is arranged tobe actuated by means of a manually operable control lever 52. A stop screw 53 is adjustably mounted on the cam and is arranged to engage a fixed stop surface 54 which is fixedly mounted'relative to the wheel slide ll.

It will be readily apparent from the foregoing disclosure that the stop screw 53 serves to limit the rotation of the cam 50 and the control lever 52 in a clockwise direction thereby controlling the speed of the reciprocation of the wheel spindle Hi. When the control lever 52 is rocked in a counterclockwise direction into position 522), the cam 55 engaging the screw 43 will rock the arm 2 in a counterclockwise direction (Fig. 9). This movement of the rock arm 41 serves to rock the rock arm 45 (Fig. 3) also in a counterclockwise direction so as to raise the downwardly projecting lug 53 into a broken line position 43b so that it is out of engagement with the groove 44. It will be readily apparent from the foregoing disclosure that when the lug 43 is moved out of engagement with the slot 44 that the arm 34 will be disconnected from the yoked member 25.

It is desirable to provide a locating device for locating the control lever 52 in the desired and predetermined positions. The control lever 52 is provided with a spring pressed ball 55 which rides upon an arcuate shaped plate 56. The arcuate shaped plate 56 is provided with locating notches 57 and 58 (Fig. 8) which are engaged by the spring pressed ball 55 when the control lever 52 is shifted. The control lever 52 (Fig. 1) is shown in a spindle reciprocating position, that is, with the stop screw 53 on the cam 55 engaging the'stop surface 55 (Fig. 9). When it is desired to stop the spindle reciprocation, the control lever 52 is moved in a counterclockwise direction, to position 5212, until the ball 55 engages the notch 58 on the arcuate shaped plate 55 in which position the rock arm 40 will be rocked to move the lug 43 into position 431), disengaging from the groove 45, thereby disconnecting the rock arm 34 and thus preventing further reciprocation of the wheel spindle [6.

A control valve 65 is formed integral with the cylinder 35. This control valve is identical with that shown in the prior U. S. patent to Wood, No. 2,212,871, above referred to and comprises a slidably mounted pilot valve 6| having a valve stem 62. The pilot valveBi is provided with a central aperture that contains a slidably mounted shuttletype reversing valve 53. An actuating arm 64 is fixedly mounted on the end of the piston rod 31. The actuating arm 64 projects upwardly into the path of a pair of spaced adjustably mounted dogs 55 and 6 5 which are in turn adjustably supported on the pilot valve stem 62. It will be readily apparent from the foregoing disclosure that the movement of the piston 35 will impart a corresponding movement to the arm 64 the upper end of which is arranged in the path of the dogs 55 and 66 so that the reciprocatory movement of the piston 35 will cause the actuating arm 64 to shift the pilot valve GI and the reversing valve 63 automatically to change the direction of movement of the piston 35. The dogs 55 and 56 are slidably guided by a slide rod 5?.

In order to facilitate adjustment of the length of the reciprocatory stroke of the wheel spindle IE, it is desirable to provide readily accessible means for adjusting the position of the dogs 65 and 5'5. The valve stem 62 is provided with a right hand threaded portion 69 and a left hand threaded portion which mate with correspondingly threaded apertures in the dogs 65 and 65 respectively. To facilitate adjustment of the reciprocatory stroke, a manually operable knob H is mounted on the outer end of a shaft 72 (Fig. 5). .The shaft 12 is journalled in bearings 13 and 14 formed integrally with the left hand cover of the pilot valve 68. The shaft 12 is provided at its rear end with a bevel gear I which meshes with a bevel bear 16 rotatab1y mounted on a stud IT. A gear I8 is fixedly mounted relative to the bevel gear I6 and meshes with a gear 19 which is fixedly mounted on the pilot valve stem 62. It will be readily apparent from the foregoing disclosure that a rotary adjustmentof the knob II will be transmitted-through the gear mechanism above described to rotate the pilot valve stem 62 and due to the right and left end threaded portions 69 and I8 will cause the dogs 65 and 66 respectively to move toward or from each other so as to regulate the reciprocatory stroke; of the fluid motor piston 36 and also the reciprocatory stroke of the wheel spindle I6. A stop screw 68 (Fig. 1) passes through a clearance hole in the dog 65 through a clearance hole in the arm 64 and it is screw threaded into the dog 66. The stop'screw 68 serves to limit the outward movement of the dogs 65 and 66 thus limiting the extreme reciprooatory stroke of the piston 36 and the wheel spindle I6 as desired.

It is desirable to provide a control valve for stopping and starting the fluid motor and also to provide means whereby the wheel spindle I6 may be positively moved into a fixed position for shoulder grinding or may be manually traversed in the grinding between shoulders. In the preferred construction it is desirable to arrange this mechanism so that the manually operable control lever 52 will not only actuate the rock arm 48 but also control the stopping and starting of the fluidmotor 68 and the traversing and positioning movement of the wheel spindle I6. The rock shaft 5| is preferably provided with an integral valve member 8| which is rotatably supported within a valve body fixedly mounted relative to the wheel slide I I'. A cam 82 is mounted on the right hand end of the valve member 6|. The cam member 82 is arranged when rotated to engage and actuate a slidably mountedplunger 83. The plunger 83 is provided with a groove 84 which is engaged by a stud 85. The stud 85 is mounted within an upwardly extending boss 86 formed integral with the yoked member 26. A compression spring 81 normally urges the plunger 83 toward the right (Fig. A pair of adjustably positioned stop screws 88 and 89- are positioned in the path of the boss 86 and serve to limit the swinging movement of the yoked member 26. It will be readily apparent from the foregoing disclosure that when the control lever 52 is rocked in a counterclockwise direction that is into stop position 52b, the cam 82 will engage the plunger 83 and may shift the yoked member 26 until the boss 86 engages the stop screw 88 thus positively limiting the movement of the yoked member 26 for shoulder grinding.

7 The valve member 8| is provided with an intake chamber 9| and an exhaust chamber 94. Fluid under pressure is supplied from a suitable source through a pipe 98. When the control lever 52 is in a start or a spindle reciprocating position, the valve chambers are positioned as indicated in Figs. 3.10 and 11 so that fluid from the pipe 98 willpass through the chamber 9| and out through a pipe 92 to the fluid motor 68 above described. In this position of the valve member 8|, fluid will be passed to the fluid motor 68 continuously to reciprocate the piston 36 and thereby to impart a continuous reciprocatory motion ofthe wheel spindle I6. The exhaust fluid from the fluid'motor 68 passes through the pipe 96 to asuitable supply oil reservoir, which may be in the base of the grinding machine.

When thelcontrol lever 52 is shifted into the intermediate position so that the control lever is 5 in the broken line position 52a (Figs. 12 and 13) fluid under pressure can not pass from the pipe 98 50 that the fluid to the fluid motor 68 is stopped thus holding the parts in a stationary position.

In this position of the control lever 52 the prolO jecting lug 43 on the rock arm 48 is raised in position with the lug in position 43a, but still remaining in engagement with the groove 44.

In this position 52a of the control lever the fluid motor 68 is therefore stopped thus locking the wheel spindle I6 againsta reciprocatory motion f or truing the grinding wheel I'I.

When it is desired to manually position the wheel spindle I6 for shoulder grinding the control lever 52 may be swung further in a counter position 52b (Figs. 14 and 15) fluid from the motor 68 may exhaust through pipe 92 through a passage 63 formed in the valve casing and into the exhaust chamber 84 andout through a passage 95 which extends by means of a drilled hole (Fig. 3) through the cam-82, thus relieving the fluid pressure within the motor 68 when the rock arm 34 is disconnected and the wheel spindle I6 is under manual control of the control lever 52. It will be readily apparent from the foregoing disclosure that by manual actuation of the control lever 52, the lug 43 of the rock arm 48 may be engaged with the groove 44 of the rock arm 34 at the same timethe valve member BI is shifted to start the fluid motor 68 45 in starting positive reciprocation of the grinding wheel spindle I6. I

' Similarly when it is desired to stop thewheel spindle I6 for a truing operation, the control lever 52 may be positioned in broken line positions 52a (Figs. 12 and 13) in which position the fluid under pressure is cut off from the fluidmotor 68 so that the wheel spindle I6 is locked against a reciprocatory movement. When it is desired to manually position the wheel spindle I6,

55 that is, to move the grinding wheel II axially into grinding relation with a shoulder'on the work piece, the control lever 52 is moved from the intermediate position with the ball 55 into engagement with the notch 51, in a counterclockeo wise direction, as desired. If it is desired to positively lock the wheel spindle I6, in an extreme left hand position the movement of the control lever 52 is continued until the ball 55 engages the notch 58 .which positively moves the wheel spindle I6 endwise until the boss 86 of the yoked member 26 engages the stop screw 88 thus positively locking the wheel spindle I6 in a fixed position when desired.

In case it is desired to provide a mechanism for reciprocating the wheel spindle or stopping the spindle and holding it against axial movement it is not necessary to provide the locking mechanism above described. In such arrangement the rock arm 48 may be fixedly mounted on the rock shaft 33 so that the rock arm 32 is fixed with clockwise direction to position 521) which move-- movement to the wheel spindle I6 through therelation to the rock arm 40. With this arrangement of the. parts, when the control lever 52 is moved to a start position the control valve 8! will be positioned to start the fluid motor 6!] and thereby continuously to reciprocate the wheel spindle l6 through the desired stroke as determined by the position of the dogs 65 and 66 and at .a speed determined by the setting of the stop screw 53. When it is desired to stop reciprocation of the spindle, the control lever 52 is moved ina counterclockwise direction into position 521). This movement shifts the valve 8| to cut oif the passage of fluid under pressure to the motor 60 thereby-stopping the fluid motor and also serves through the cam 82 to move the spindle l6 axially toward the left into a fixed position for a grinding operation.

Theoperation of the improved wheel spindle reciprocating mechanism will be readily apparent from the foregoing disclosure. Assuming the dogs 65 and 66 together with the'stop screw '68 have been previously adjusted, the grinding operation may be started. If it is desired to plunge-cut a work piece, the control lever 52 may be rocked in a clockwise direction into the position illustrated in Fig. 1 so that the stop screw 53 engages the stop surface 54 which serves to start the fluid motor 60 and also to allow the released compression' of the spring 45 to rock the rock arm 48 so'that the lug 43 engages the groove 44 in the rock arm 34, thus rocking the rock arm 34 so that it will transmit 'reciprocatory motion from the fluid motor 60 to the yoked member 26 continuously to reciprocate the wheel spindle I5.

By adjustment of the stop screw 53, the position of the valve 8| may be varied so as to regulate the passage of fluid to the motor 60 and thereby to facilitate regulation of the speed of the'motor 60 and the speed of reciprocation of the spindle l6 and grinding wheel 11.

When it is desired to stop reciprocation of the wheel spindle IS the control lever 52 may be moved to position 52a (Figs. 12 and 13) so that spring pressed ball 55 engages notch 51 (Fig. 8) which movement serves to cut off fluid pressure to the fluid motor 60 and thus stops reciprocation of the spindle l and to hold it against reciprocation in case it is desired to true the grinding wheel II. If it is desired to manually move the wheelspindle I6 axially within its bearings to positionthe grinding wheel I! for a shoulder grinding operation the control lever 52 may be moved further in a counterclockwise direction. The spring pressed ball 55 rides out of the notch 51 during this movement of the control lever 52 and the lug 43 moves out of engagement with the groove 44. The cam 82 then engages and moves the plunger 83 which in turn moves the spindle l6 axially within its bearings to position the grinding wheel H as determined by the setting of the stop screw 88. At this position the ball 55 engages the notch 58.

It will thus be seen that there has been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in alimiting sense.

I claim:

1. In a grinding machine having a transversely movable wheel slide, spindle bearings in said slide, a rotatable axially reciprocable wheel spindle supported in said bearings, means including a fluid motor to reciprocate said spindle, a control valve therefor, means including a normally operative locking device to connect said motor with said spindle to reciprocate the spindle for a plunge-cut grinding operation, a manually operable control lever to actuate said valve, and means actuated by said lever when the lever is shifted to close said valve to disconnect said motor from said wheel spindle.

2. In a grinding machine having a transversely movable wheel slide, spindle bearings in said slide, a rotatable axially reciprocable wheel spindle supported in said bearings, means including a fluid motor to reciprocate said spindle, a control valve therefor, means including a normally operative locking device to connect said motor with said spindle to reciprocate the spindle for a plunge-cut grinding operation, a manually operable control lever to actuate said valve, and a cam actuated by said lever when the lever is shifted to close said valve to disconnect said motor from said wheel spindle.

3. In a grinding machine having a transversely movable wheel slide, spindle bearings in said slide, a rotatable axially reciprocable wheel spindle supported in said bearings, means including a yoked arm to reciprocate said spindle, a fluid motor, a control valve therefor, a rock arm oscillated by said motor, means to connect said arm with said yoked arm, and a manually operable control lever which is arranged simultaneously to actuate said valve to start said motor and to actuate said connecting means to start reciprocation of said spindle.

i. In a grinding machine having a transversely movable wheel slide, spindle bearings in said slide, a rotatable axially reciprocable wheel spindle supported in said bearings, means including a yoked arm to reciprocate said spindle, a fluid motor, a control valve therefor, a rock'arm oscillated by said motor, means to connect said arm with said yoked arm, and a manually operable lever which is arranged simultaneously to actuate said valve to stop said motor and to disconnect said connecting means so as to stop reciprocation of said spindle.

5. In a grinding machine having a transversely movable wheel slide, spindle bearings in said slide, a rotatable axially reciprocable wheel spindle supported in said bearings, means including a fluid motor to reciprocate said spindle, a control valve therefor, means including a normally operative locking device to connect said motor with said spindle, a manually operable control lever to actuate said valve, means actuated by said lever when the lever is shifted to close said valve to unlock said device and thereby disconnect the motor from said spindle, and means actuated by said lever to move said spindle axially within its bearings to position the spindle for a-shoulder grinding operation when the fluid motor is stopped and said locking device is unlocked.

6. In a grinding machine having a transversely movable wheel slide, spindle bearings in said slide, a rotatable axially reciprocable wheel spindle supported in said bearings, means including a fluid motor to reciprocate said spindle, a-control valve therefor, a manually operable control lever to actuate aid valve, means to adjust the normal aperture of said valve tofacilitate adjustment of the speed of reciprocation of said spindle, and means actuated by said lever when the lever is 9 shifted to close said valve to move said spindle axially within its bearings to position said spindle.

7. In a grinding machine having a transversely movable wheel slide, spindle bearings in said slide, a rotatable axially reciprocable wheel spindle supported in said bearings, means including a fluid motor to reciprocate said spindle, a control valve therefor, means to vary the stroke of said motor so as to adjust the reciprocatory stroke of the spindle, a manually operable control lever to actuate said valve, and means actuated by said lever when the lever is shifted to close said valve to move said spindle axially within its bearings to position said spindle.

8. In a grinding machine having a transversely movable wheel slide, spindle bearings in said slide, a rotatable axially reciprocable wheel spindle supported in said bearings, means including a yoked arm to reciprocate said spindle, a fluid motor, a control valve therefor, a rock arm oscillated by said motor, said rock arm being connected to oscillate said yoked arm, a manually operable lever to actuate said valve, and means actuated by said lever to move said spindle axially within its bearings to position said spindle when the fluid motor i stopped.

9. In a grinding machine having a transversely movable wheel slide, spindle bearings in said slide, a rotatable axially reciprocable wheel spindle supported in said bearings, means including a yoked arm to reciprocate said spindle, a fluid motor, a control valve therefor, a rock arm oscillated by said motor,.said rock arm being connected to oscillate said yoked arm, a manually operable lever to actuate said valve, and means including a cam actuated by said lever to move said spindle axially within its bearing: to position said spindle when the fluid motor is stopped.

10. In a grinding machine having a transversely movable wheel slide, spindle bearings in said slide, a rotatable axially reciprocable wheel spindle supported in aid bearings, means including a yoked arm to reciprocate said spindle, a fluid motor, a control valve therefor, a rock arm oscillated by said motor, means to connect said arm with said yoked arm, a manually operable lever to actuate said valve, means actuated by said lever to operate said connecting means to disconnect said motor from said spindle, and means actu ated by said lever to move said spindle axially within its bearings to position said spindle for a shoulder grinding operation when the fluid motor is stopped and said connecting means is disconnected.

11. In a grinding machine having a transversely movable wheel slide, spindle bearings in said slide, a rotatable axially reciprocable wheel spindle supported in said bearings, means including a yoked arm to reciprocate said spindle, a fluid motor, a control valve therefor, a rock arm oscillated by said motor, means to connect said arm with said yoked arm, a manually operable lever to actuate said valve, a cam actuated by said lever to operate said connecting means to disconnect said motor from said spindle, and means including a second cam actuated by said lever to move saidispindle axially within its bearings to position said spindle for a shoulder grinding operation when the fluid motor is stopped and said connecting means is disconnected.

HERBERT A. SILVEN. 

